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TIR1-like auxin-receptors are involved in the regulation of plum fruit development

El-Sharkawy, Islam and Sherif, Sherif and Jones, Brian and Mila, Isabelle and Kumar, Prakash P. and Bouzayen, Mondher and Jayasankar, Subramanian TIR1-like auxin-receptors are involved in the regulation of plum fruit development. (2014) Journal of Experimental Botany, 65 (18). 5205-5215. ISSN 0022-0957

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Official URL: http://dx.doi.org/10.1093/jxb/eru279

Abstract

Ethylene has long been considered the key regulator of ripening in climacteric fruit. Recent evidence showed that auxin also plays an important role during fruit ripening, but the nature of the interaction between the two hormones has remained unclear. To understand the differences in ethylene- and auxin-related behaviours that might reveal how the two hormones interact, we compared two plum (Prunus salicina L.) cultivars with widely varying fruit development and ripening ontogeny. The early-ripening cultivar, Early Golden (EG), exhibited high endogenous auxin levels and auxin hypersensitivity during fruit development, while the late-ripening cultivar, V98041 (V9), displayed reduced auxin content and sensitivity. We show that exogenous auxin is capable of dramatically accelerating fruit development and ripening in plum, indicating that this hormone is actively involved in the ripening process. Further, we demonstrate that the variations in auxin sensitivity between plum cultivars could be partially due to PslAFB5, which encodes a TIR1-like auxin receptor. Two different PslAFB5 alleles were identified, one (Pslafb5) inactive due to substitution of the conserved F-box amino acid residue Pro61 to Ser. The early-ripening cultivar, EG, exhibited homozygosity for the inactive allele; however, the late cultivar, V9, displayed a PslAFB5/afb5 heterozygous genotype. Our results highlight the impact of auxin in stimulating fruit development, especially the ripening process and the potential for differential auxin sensitivity to alter important fruit developmental processes.

Item Type:Article
HAL Id:hal-01142528
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Damanhour University (EGYPT)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > University of Sydney (AUSTRALIA)
Other partners > National University of Singapore - NUS (REPUBLIC OF SINGAPORE)
Other partners > University of Guelph (CANADA)
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Deposited By: Brigitte LAFFORGUE
Deposited On:15 Apr 2015 12:44

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